We use GetEditorWorldCounterpartActor in the sequence recorder which cant work in standalone builds as it relies on GEditor. The best fix would probably be to just add a guard for GEditor to GetEditorWorldCounterpartActor and GetSimWorldCounterpartActor.

I have a shelf (from Dev-Framework) with the fix ready to go in CL 3113460.

Steps to Reproduce

Create a new project based on the BP FPS template
Launch the game standalone
At the console, type "RecordSequence all"
Run about, jump, fire your gun
console, type "stoprecordingsequence"

Expected: It shouldn't crash and there should be a saved level sequence asset with animation assets in Content/Cinematics/Sequences

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ComponentUE - Anim - Sequencer
Affects Versions4.13
Target Fix4.13.1
Fix Commit3114382
CreatedSep 5, 2016
ResolvedSep 6, 2016
UpdatedApr 27, 2018